Solution : https://service.sap.com/sap/support/notes/114454 (SAP Service marketplace login required)
Key words : 
system generates termination message v1854, additional key words va01, planned order processing, sales order items, sales order, assembly processing, assembly order, sales document, internal error, program saplcud0
Related Notes : 
       
| 114044 | |
| 113616 | CX701 when you change/display a sales document |